The current interdomain routing protocol, Border Gateway Protocol, is limited in implementations of universal security. Because of this, it is vulnerable to many attacks at the AS to AS routing infrastructure. Initially, the major concern about BGP security is that malicious BGP routers can arbitrarily falsify BGP routing messages and spread incorrect routing information. Recently, some authors have pointed out the impact of a type of attack, namely selective dropping or malicious dropping attack that has not studied before. The malicious draping attack can result in data traffic being blackholed or trapped in a loop. However, the authors did not elaborate on how one can detect such attacks. In this paper, we discuss and analyse a method that can be used to detect malicious dropping attacks in the Internet.